Which diagnostic study is commonly used to assess for unstable angina when the presentation is not STEMI?

• A. Nuclear Bone Scan
• B. Stress Testing
• C. ABG Analysis
• D. CT Angiography

Answer: (B)

The key idea is using a test that reveals inducible myocardial ischemia to risk-stratify and guide management after stabilization in suspected unstable angina not presenting as STEMI. A noninvasive stress test—such as an exercise treadmill test with ECG or a pharmacologic/stress-imaging study—provoke ischemia under increased demand. If ischemia is detected, it suggests significant coronary obstruction and helps decide whether medical therapy alone or revascularization is needed. If no ischemia is found, the patient is considered lower risk and can often be managed medically with close follow-up.

Nuclear bone scanning isn’t used to evaluate cardiac ischemia, so it doesn’t inform angina assessment. ABG analysis measures gas exchange and oxygenation, not coronary ischemia. CT angiography can visualize coronary anatomy but doesn’t assess the functional consequence of stenoses and is not the primary test for unstable patients in whom ischemia assessment guides urgent management.